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KVPY 2020-21 SB SX Exam Previous Papers
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Ā© examsnet.com
Question : 59
Total: 120
A compound is formed by two elements M and N. Element N forms hexagonal closed pack array with 2/3 of the octahedral holes occupied by M.
The formula of the compound is :
M
4
N
3
M
2
N
3
M
3
N
2
M
3
N
4
Validate
Solution:
Number of atoms of element āNā per unit cell = 6
Number of atoms of element M per unit cell
=
2
3
(Number of octahedral voids per unit cell)
=
2
3
Ć
6
=
4
M
:
N
=
4
:
6
=
2
:
3
Formula is
M
2
N
3
Ā© examsnet.com
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